FLOOD WARNING SYSTEM
This brochure describes the flood
warning system operated by the Australian Government, Bureau of
Meteorology for the Noosa River. It includes reference information
which will be useful for understanding Flood Warnings and River Height
Bulletins issued by the Bureau's Flood Warning Centre during periods of
high rainfall and flooding.
|Lake Cooroibah||Contained in this
document is information about:
(Last updated April 2014)
The Noosa River has a catchment area of approximately 1900 square kilometres at its mouth. The Noosa River flows into Lake Cootharaba and Lake Cooroibah before flowing through Tewantin and out to its mouth at Noosa Heads. At Noosaville and Tewantin, the 1992 flood of 1.8 metres resulted in twelve homes being severely flooded. Many others along the Noosa River were surrounded by water which went under high-set homes and flooded businesses. The damage was not as bad as in 1968 when the Noosa River peaked at two metres. At Boreen Point, the caravan and camping grounds, the Lake Cootharaba Sailing Club, five houses and the general store were all flood damaged in the 1992 event. Lake Cootharaba peaked at 3.30 metres and Lake Cooroibah at 2.55 metres. Both these peaks were greater than those in 1968.
Only the two major floods in February 1992 and August 2007 have occurred, since the initial flood warning network was installed in 1987, however historical records show the 1968 flood was of similar magnitude. The figure below shows the annual peak heights which have been recorded at Lake Cootharaba and Tewantin.
The Bureau of Meteorology operates a flood warning system for the Noosa River catchment based on a rainfall and river height monitoring network shown on the map. The network consists of an automatic ALERT system, as well as a number of volunteer rainfall and river height observers who forward observations by telephone when the initial flood height has been exceeded at their station.
The Bureau's Flood Warning Centre issues Flood Warnings and River Height Bulletins for the Noosa River during flood events. Qualitative flood forecasts are issued when moderate flood levels are likely to be exceeded.
The Noosa Shire Council is able to provide further information on flooding in your area of the Noosa River catchment.
The Noosa River ALERT system was installed in January 2001 by the Noosa Shire Council, with the assistance of the Bureau. It was funded through the Regional Flood Mitigation Program. The system consists of a network of rainfall and river height field stations which report via VHF radio to base station computers in the Council office at Tewantin and in the Flood Warning Centre in Brisbane.
The Noosa River monitoring network has eight field stations - three which measure lake level/river height and rainfall, and four which measure only rainfall in the headwater areas. The remaining station continuously monitors the tide at Noosa Heads. These field stations send reports for every 1 millimetre of rainfall and every 50 millimetre change in water level. The base station computer collects the data and has software that displays it in graphical and tabular form. The data is transmitted to the Bureau's Flood Warning Centre in Brisbane where it is used in hydrologic models to produce river height predictions during times of heavy rain and flooding.
The Bureau of Meteorology issues Flood Warnings and River Height Bulletins for the Noosa River and adjoining river systems regularly during floods. They are sent to radio stations for broadcast, and to local Councils, emergency services and a large number of other agencies involved in managing flood response activities. Flood Warnings and River Height Bulletins are available via :
Radio stations, particularly the local ABC, and local commercial stations, broadcast Flood Warnings and River Height Bulletins soon after issue.
These include the Councils, Police, and State Emergency Services in the local area.
Internet/World Wide Web
Flood Warnings, River Height Bulletins and other weather related data is available on the Bureau's Web page at http://www.bom.gov.au . The Queensland Flood Warning Centre website is http://www.bom.gov.au/qld/flood .
Flood Warnings are available through a recorded voice retrieval system, along with a wide range of other weather related and climate information.
|Main Directory||Phone||1900 955 360|
|Flood Warnings||Phone||1300 659 219|
Telephone Weather Services Call Charges:
1900 numbers: 77c per minute incl. GST; 1300 numbers: Low call cost - around 27.5c incl. GST.
(More from international, satellite, mobile or public phones)
Flood Warnings and River Height Bulletins contain observed river heights for a selection of the river height monitoring locations. The time at which the river reading has been taken is given together with its tendency (e.g. rising, falling, steady or at its peak). The Flood Warnings may also contain predictions in the form of minor, moderate or major flooding for a period in the future. River Height Bulletins also give the height above or below the road bridge or causeway for each river station located near a road crossing.
One of the simplest ways of understanding what the actual or predicted river height means is to compare the height given in the Warning or Bulletin with the height of previous floods at that location.
The table below summarises the flood history of the Noosa River catchment - it contains the flood gauge heights of the more significant recent floods.
|River height station||Coops Corner||Boreen Point||Lake Cooroibah||Tewantin|
Historical flood heights for all river stations in the Noosa River catchment Floodwarning network, as shown on the map, are available from the Bureau of Meteorology upon request.
NOOSA RIVER CATCHMENT - ASSESSMENT OF THE FLOOD POTENTIAL
Major flooding requires a large scale rainfall situation over the Noosa River catchment. The following can be used as a rough guide to the likelihood of flooding in the catchment:
Average catchment rainfalls in excess 200mm in 24 hours, may result in stream rises and the possibility of moderate to major flooding and local traffic disabilities in the middle to lower reaches of the Noosa River below Tewantin extending downstream.
Average catchment rainfalls in excess 300mm in 24 hours, may result in significant stream rises and the possibility of severe major flooding and local traffic disabilities in the middle to lower reaches of the Noosa River below Tewantin extending downstream.
At each flood warning river height station, the severity of flooding is described as minor, moderate or major according to the effects caused in the local area or in nearby downstream areas. Terms used in Flood Warnings are based on the following definitions.
|Minor Flooding :
Causes inconvenience. Low-lying areas next to watercourses are
inundated. Minor roads may be closed and low-level bridges submerged.
In urban areas inundation may affect some backyards and buildings below
the floor level as well as bicycle and pedestrian paths. In rural areas
removal of stock and equipment may be required.
Moderate Flooding :In addition to the above, the area of inundation is more substantial. Main traffic routes may be affected. Some buidlings may be affected above the floor level. Evacuation of flood affected areas may be required. In rural areas removal of stock is required.
Major Flooding :In addition to the above, extensive rural areas and/or urban areas are inundated. Many buildings may be affected above the floor level. Properties and towns are likely to be isolated and major rail and traffic routes closed. Evacuation of flood affected areas may be required. Utility services may be impacted.
Each river height station has a pre-determined flood classification which details heights on gauges at which minor, moderate and major flooding commences. Other flood heights may also be defined which indicate at what height the local road crossing or town becomes affected by floodwaters.
The table below shows the flood classifications for selected river height stations in the Noosa River catchment.
River Height Station
First Report Height
Minor Flood Level
Crops & Grazing
Moderate Flood Level
Towns and Houses
Major Flood Level
The above details are correct at the time of preparing this document. Up-to-date flood classifications and other details for all flood warning stations in the network are at:
For the latest rainfall and river height conditions please use the following link:
For the latest rainfall and river height network map please use the following link:Network maps
For further information, contact:
The Regional Hydrology Manager, Bureau of Meteorology, GPO Box 413, Brisbane Q 4001